No More WiFi Outside The House On Samsung Galaxy Ace 3

Thanks, but I really don't want to lose all my data and I'd like to know how to fix it properly if it happens again. I tried forgetting all the ones I could and then I went to Asda and Tesco to test them. In Asda I was eventually able to get a connection after I was texted an access code, which I haven't had to do before, but it did work. In Tesco there was clearly Tesco WiFi available which said it was connected, but I couldn't connect to the Internet. There was also another network called BT Openzone which appeared to be active at the same time and whenever I tried to use Google Chrome, it just forwarded to btopenzone.com, so I don't know if that was taking over somehow. Also, the only non-secure WiFi network that I was unable to forget was BTWiFi-with-FON. I think I may have tried to connect to that about the time I started having the problem, but it asked me for money so I ignored it, so that may be the cause.

I decided to reset my phone to factory settings and enter my contacts in again and re-download my apps, which I've now done. I went to Tesco and tested my phone. The Amazon app which I like to use in shops told my I wasn't connected. When I tried to use Chrome, it worked when I searched for something in Google, but when I clicked on a result which should have gone to Wikipedia, I got a message saying: "This is probably not the site that you're looking for". There was a lot of text which told me that my phone was trying to go to btwifi.com instead of wikipedia.org. When I checked my WiFi connections it said it was connected to Tesco, but BTWiFi-with-FON is still there too and I can't seem to get rid of it.

I've been to Tesco twice in the last couple of days to test. There's only one Tesco WiFi network available. Up to now it's been saying it's connected, even though it seemingly hasn't, but the last couple of days it's been saying there's no signal or it's not strong enough. I asked at customer services and I was told that the WiFi should be working fine and that it was strongest at the coffee shop section. I went to the coffee shop, but my phone still said the Tesco network was too weak to connect.

Since you can't connect elsewhere it's now a problem that you take up with seller or maker.